Year Number 1996 0.584521055221558 1998 0.631555795669556 2000 0.577083766460419 2002 0.559019982814789 2003 0.670592188835144 2004 0.562500655651093 2005 0.541108727455139 2006 0.513664186000824 2007 0.544856309890747 2008 0.610460937023163 2009 0.586034953594208 2010 0.596930503845215 2011 0.601400375366211 2012 0.594521701335907 2013 0.494515269994736 2014 0.539543569087982 2015 0.483489394187927 2016 0.379885047674179 2017 0.359771251678467 2018 0.383702307939529 2019 0.434365034103394 2020 0.382423937320709 2021 0.454513996839523 2022 0.467351377010345